Rubik's 3x3x3 O-type (1) Square-3

Function is like the rubik's cheese I've published here.
I wanted to make a test of the 2D subsystem of openscad. Result is this cube.

Slicing without XY_size_compensation. I have designed a big gap between the moving parts. (0.3mm to each side is 0.6mm gap in the model.)
Print the number as written in filename. PLA/ABS doesn't matter. Remove all blobs and irregularities carefully. Glue the core parts ( out-in-in-out) together, stabilize with pieces of 3mm ABS filament. Flat sides to outs